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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d76842d1f8423879888f5997e75c5351ecfe22d0257a5329b2562d867c0a18d' 
  AND token = 'msnVOoiG2vGrr3mHD0E189D6Iitm1qJz9L2ZHDiPHJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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