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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87f540ced0d069a2cdb906789a713aab2234c2890154c9cefcd8d3ff29bdbef9' 
  AND token = 'NFeIIHtXNQ2tEg8qsFbVXEBOB6gTiSBUo3SwmVSWXi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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