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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e37e823d0e916f8b52d70bfe9c0c359fa9ceff35b6b33de7984c64d5d8199e2' 
  AND token = 'eosqXtlJ2pSjvJorejVuj2ZrA+boCUO5U0amBFBoF0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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