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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c83da25c237257607d6d4974409acc747265294d6b30dd7438d50bca7499d8b1' 
  AND token = '1zpjoe9WsFBnYnskE1e/cDr1w6kwhjFlM5JbHq0xTFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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