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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91facaf25d6f401cbc1af3893755fe604c40d3d6e6bfb32f0088a200e45bb0de' 
  AND token = 'E+fygTZqAOQO7iikSU0c6avDyIeC/ULoawoL0nAL1tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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