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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bef59066cf71f7883bd38dfd3a4f52f3bbdc3a0553508fbf6c7b5bdaba91ef99' 
  AND token = '00wChmjYyp0+Op0vo+PM7ATgnR3qJ2xeM37WEhvFY6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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