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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b1b1656036546b8d8c99a46f1788dc101277300beeac062d89d97855541f54be' 
  AND token = 'XTN2BNTNVE8ac1WkmcQhnv/DFaALu4IBnpbO5vduvkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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