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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c27d1bed1c34ed85301f7955d28e3283f16b7e8a8215823606b9997e83972c75' 
  AND token = 'PaGjfN0m8i3niQ9ROcL2nXwN7+fKL2o5B41dNUDIZB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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