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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13d61d2c50c07486c9745864d9e8e8d8c981d52cd46d9477c5b66ed59761f7cb' 
  AND token = 'JWsBRrmR9hFFNdbKvk1Kj5PrTCvZlYzmBdmz2vLKIEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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