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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e039b4801d1c56207b2361bc3ad5669c85ef3f5fdde5cd0c11dee31b801b157' 
  AND token = '83E6EwZc1bWM6wKHF5Lq/H3hvgpNYSID+S+kP3oLUSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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