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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2658114f2ce1682b192d4b3e1dec0d5b33fc0bc223cc41bd4b71177d63ba61b' 
  AND token = 'rrPu6Ymvn3pdiwt1hwcCyn68Dw5uCLUk9wm+eU1BQUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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