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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0739fde0133cda5e1ebfb53d7e9fe692ac192f75e9bb3a51058201134d111b23' 
  AND token = 'eIOBfa6j8Y1d/qjOEDG5/IfvI88A73/XW41HmGjzaGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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