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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '814a2f77cf3c446464ceae10883fef322b2fdf2b6c5077ba0866cf10343900b4' 
  AND token = '0qYb96Dj1HWobbYPyw2MuHpFtEdf6CF6NZEsbaqMVqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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