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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f94e9474f03fc2fcd9a81e81afd73714b83bde651e3f45a79053d33114a40e9c' 
  AND token = '9/bIuabE5seiGVVvBrx7LEcPc1Yxld6+4eA7M6/6WrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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