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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26d3fda97d8a9bd542fa128071b162863bea1ef43e38866458f3990d8867f524' 
  AND token = 'NP5/K0Mj0bbZ/NNjwk1wL8pLXSXO5Y2OCbRT1pGwYCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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