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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a555c73fc13f9b31b6c4b6aac5ff39fb1dab69e86ca3fb669362356b87b4b3bc' 
  AND token = 'sexOvxmvRlZt7eCpWT/l9FNeLiZQPzvismDIVRs4F7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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