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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9975ec8302b5e68614a2b61506380a3b62ac3d1a6cafd765340070971b4ff2b7' 
  AND token = 'sDm6QQgcuJ+CkYr9eguatl1OMDitSZZQP5WU+8Sxdtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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