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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c11dcc5d02d2fd391fb775e404d85c894ade28e1c44b6e82ffa29e71becdda0' 
  AND token = 'kiAG4ewHz6ZNUfdTyhKJ51eFnyS8OH0vLXbqROq5Ve0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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