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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efcb172864bb1ad916df124bae675bd19276ad7aeee77c85eca8555d121d6b9a' 
  AND token = '69ZLMSG5Fhs1hnw+9uxYd48ouR3px2vRUNO7L1DW9zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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