SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a004f677bec549a8771e33f3e78e9c696e18d8bcb13cb4de5d80c99f295b9018' 
  AND token = 'QSqy1UHvaHikBpooF6BE5w6WZJ2BYfA4jl8LtYKIPF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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