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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0c345b5689ff019e86759e39c61bcccf7474583bc2cf6a0c8e7374ac1b93925' 
  AND token = 'JKXgS+ikdn4Ip7cdsWs3wyYv4GHv5h7G7X1kOtROEiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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