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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba6404863366c1dafc248284d723d9dea45888966519b5993fa46d57f112a0fa' 
  AND token = '9d0QxUi16tUr5eIY+H0sUYcXQlUD0aXYzsecMQ2gtAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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