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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '728e202bebfaeaca35eee730b25c9156c9ec092a2b78046340e6a7d03c8e4bc2' 
  AND token = 'bnzcBYtXmcWJX8Nc7r2vWTRSUqx6e/QUWzg9jM6ZXPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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