SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86f8a4c08c2f048921adbac4ead2cf990b81e7e5758df7bd4e51f4a045d9319a' 
  AND token = 'IjmXwdYJvtn7Ro+BxxHMl5UyDxVR2dPfBthw1hjfsNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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