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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f408b1be7466a8af596224285f229d82c8da26ff4bc73c2ea2977f716c247ca0' 
  AND token = 'wNiZEPyxKpogFStnfZtR9hs4XXm20bEielaSdy0wwBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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