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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b81f1172148b7574d6216a36a347f5e468964447eacaaf1b13b1f0a8bc59911a' 
  AND token = 'DRKpNbNFCHdSeUEKO6+Z5lHMZgf13CqlHxlbbs/nyI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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