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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a982bbdcc14f8cc5e161c9866b2decff1a277afc12e05b38362b3e5923c45da5' 
  AND token = 'x1fXr6Ow0wdpyiBV69epIMd5CktqFnd9V0aFN9hUtcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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