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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcbdcabd811ae0baa8a78647c8c4577b8727f1772e898c7d4a3aafd95333edd3' 
  AND token = 'U3nNS742B5TCH6DyO0XkhHFQdsMwCTDZYFtfowvK0gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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