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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c67f095d308c9d833d7f0a878851cc57fabe70073e72f2cf5302e75d3bf5884' 
  AND token = 'G7VuNyvqUriAp0omabMLcRDrc1dJAfq2KVDdZgeLtdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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