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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db63efb7468c593e8b0eff84a7c73fcdb207d1b5f48e50b23ef51aa9202975dc' 
  AND token = '8OB9PiV/1MmVOxIO1x9Gmm+dlC581cTvnVpEZrqkD6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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