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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea5e3aeebdef6544dfed57370a168ce4e60b9120e9bb75450d2571a3adbbf963' 
  AND token = '7Cap+3CqBDcQUQ+lAbBmrMscQT2LKtajtPBVBW6TcwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}