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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42e768724aafeeb43128ea4f31a573006540d5da95aec3d5b1f21c7c73a950e0' 
  AND token = '6yzlYA1u5GXsac0cxzW9itoZQbSwpfJCbCC4lh3YTpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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