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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36b13962add4f490fdd986829bcab49ed38d76ddd8dd05406e001ecbd59d6f41' 
  AND token = '9mM5UHe8za4+E7agXlJJ41y7Wo8nogdA51GY37m6m3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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