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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba74f48b46e5908fc49c0f07d16b0d828a85e896203e30b771e018b8eeae6e08' 
  AND token = 'nnDSzEMPHs9aWhblt03VFUfuZ/dd6PJ8eaKy0yjnjMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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