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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c975d0731ee0ca65124da77a6527378e81f485e91b5b232671c17f4ae8be9ab' 
  AND token = 'ZlVhQnwlr5zoErtZFIeWwsNFrQXLt5y6wmalY5SG8ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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