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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66423ab184dc67fb958b3ef0e0c473b099270f03d1d6862018905d13fa6c2afe' 
  AND token = 'Y6DYqOn/1bn3r7cAAXIUG7DEeyIRaFmngpiGTRMOsyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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