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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c8ff9bdde100a7c736229328976342a006e806da35b996d5d10b0454ac29ec1' 
  AND token = 'QCAoQFgC7jiGJo6Kl8DjrjGamaNy19uYr4rScpq9yIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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