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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4bba40e37c334bd010dfb7daf9a8a482f388519e1cb10cc367f6c3a4d864909' 
  AND token = 'd3z4Gt0mxxJ4MyRUhXzvznq0ZdHTXmX7uhz+ziwntaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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