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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '816bf64edabbebe7a99d994b12539d7db355697bf005fb1011bff1a20148e143' 
  AND token = '8ZQWf6ZWLq5y1R4xlsVDuAy9x41RitD0zA9neRwFte8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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