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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f59b0a11693ee1dfbb26045ad67583210185565a863e1e26e7658b1f332815ca' 
  AND token = 'nxQ4Wt4nkCVcMSs6NGOW29Nlx62tGG6KfVH9YOwva9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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