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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a11e87580f76a6d31ab64d8e801503c831a71167e357d2baa66fb8f1635406dd' 
  AND token = 'EC8t+IwG6IDLwUBs/COL9X3FC990F1AkR2SB0WNGSE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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