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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e73bc5e4c16305f547fe4e4366ebd74b85ed6817aa648e96af656e8b3f675dac' 
  AND token = '/ZKZm0ScG1/6DpXGuwdN072nnjLG0a9tRh+FU6uyAOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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