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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c35f7e98dbfe262a642e6b5867d302df0e63e0e65bd3a603ea0ee54d210a37a' 
  AND token = 'ZIWAQ0f20SrWMNKFeaww3U+/lowcOVGbqQKULR/rVSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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