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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7288ac2e999461a86e04d759a6202f778a5ae365252dee1086ade0beb7ac23a' 
  AND token = 'YmWumC/7uxNi8t73q/USURE8zfS3ABQfe3dKzuU+2vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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