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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f2cc533c078ae9a2695942da8aa3f9b4590e7a18202a230d1431b584d662f07' 
  AND token = 'T1kibM8f3dKWxm+oWsTuGPS2meTL3SGq5dt9EBvQV/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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