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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9dab556cfdc852d4ae8cb9c3b81db43b97c42bc6ee974cc59f62979a2905d428' 
  AND token = 'WfhiMp7H5Kh1pVBL8orobAU8eE7NIWZXEKI3o6l0+X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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