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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68f66b1ac282b6cc2b1f15a9f3a435eb030e73f7a9f8dd19fc9a0da88177f0f5' 
  AND token = 'JRHQY88ksnt9NNTrkLdxMXqfxVpX6OztVG7NAK82BKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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