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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab616312df0d50f8818d5ee53d01f5a9b7257f390823d7a5089be9bdc95a51aa' 
  AND token = 'PHxs/EcMKYztX3q7GBlbZKG9xvDUxE8CXD3NSED3BVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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