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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '701702dacbdd6365610e15eca49c21608d2be93a8d08bd5a9135cad770d5f138' 
  AND token = 'dYcRNhKIFxu6gbrcYEiCy/UN6BuW+P6JGDLrDDCXgJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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