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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f9c0ca71d2a00a8f22990f1bfc271ba03b02d502f701b8e01a2a81e71f2e824' 
  AND token = 'dgo9NmKIgLNAkCbLIaF0DlCpKgIfeGugpdd+aa93OuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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